Light hollow spheres
For cementing oil wells, This is a wonderful natural material. The hollow spheres outer wall is made of silica or alumina. The weight of slurry is less if the light hollow spheres are added during slurry manufacture. The spheres have pozzolanic behaviour. Due to this behaviour, the slurry does not loose its cementing property achieved due to properties of cement. Light hollow spheres are preferred having size of 10 to 500 micron.
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Vipin Dave
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